LCD scrap
- Thread starter warlead
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patnor1011
Well-known member
Are they magnetic?
Completely dissolve a small piece in a little 50/50 nitric. If any gold flakes remain, it is gold plated. However, I think I've seen these before and I'm thinking they're just brass with no gold. Don't go by what I think, though. Test them yourself.
patnor1011
Well-known member
If back is white it may be anodized aluminium. My rule in electronic scrap is simple. Do not think that everything what is yellow is gold. Try to think what is the purpose of putting gold on that piece and if you would put gold there as manufacturer. Test everything you can. If you cant get nitric snipe small bit and put that in HCl. Bit slower than nitric but something anyway.
othercompguy
Member
I replace laptop screens once in a while and I save the old ones to display. After reading this I decided to take a look at them a bit closer:
Militoy
Well-known member
patnor1011 said:
I always try to keep this rule in mind - and some gold plating over brass can also be very thin - a flash well under 10 microinches will still look like pretty gold when the brass underneath is visible through the plating. It works the other way around as well - I picked up a large box of bridge rectifiers that had failed their in-process testing. The faston terminals looked to me to be unplated brass - but that didn't make sense from the standpoint of solderability. I pulled the datasheet on the parts - and they are plated with 30 microinches minimum of gold.
I thought it would be worthwhile to note that I will pay Motherboard rate for those green board strips with the gold plating that Claudie posted on the previous page of this thread. At the time of this posting that is $4.20 per pound.
joem
Well-known member
I now trade dead 17" lcds monitors for about 15 motherboards,
and I picked up non working 26 inch lcd tv with hd computer input , lots of bells and whistles for free
Brought it to my guy who trades me and he fixed a loose power supply.
Now I have a free lcd tv.
So sometimes the value is not in the teardown.
and I picked up non working 26 inch lcd tv with hd computer input , lots of bells and whistles for free
Brought it to my guy who trades me and he fixed a loose power supply.
Now I have a free lcd tv.
So sometimes the value is not in the teardown.
jimdoc
Well-known member
I got a non working 32" Memorex MLT3221 TV and fixed it for less than $20 with this capacitor kit;
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230559455195&ssPageName=STRK:MEWNX:IT
Having an ESR meter comes in handy also.
Jim
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230559455195&ssPageName=STRK:MEWNX:IT
Having an ESR meter comes in handy also.
Jim
macfixer01
Well-known member
If you have a working LCD monitor that's not much use to you anymore, the guys from MAKE magazine had a video online that showed you how to turn one into a video projector. Basically what it amounts to is removing the glass panel and electronics from an LCD monitor, then making a box to mount it into along with a properly placed Fresnel lens and a high intensity lamp and power supply. I'm sure is linked off their website somewhere, I found it online browsing with my AppleTV box so don't know the URL.
macfixer01
macfixer01
tlcarrig
Well-known member
Ok, so we have gold, iridium or indium and mercury in the flourescent bulb in an LCD screen. What else would we be looking for? Is there anything else that we should be careful about besides the Hg? Anybody have any ideas on recovering the iridium? Wish I was close to joem. Would love to swap my dead LCDs for a bunch of MBs. What I have though are small LCDs. Oh well.
do those ribbons on the sides have gold in them? they look goldish and if they are would AR get it out of the plastic?Claudie said:This photo shows the boards still attached. The thin gold wires run along two sides of the glass, that's the only obvious gold I could find. You need a magnifying glass to see them.
kurtak
Well-known member
I sell LCD monitors as is to Dynamic - I get $6 each for 17" & larger (which is more then the value of the boards in them & I don't end up with a bunch of worthless plastic & the worthless screen to deal with) for 15" monitors & monitors with no base they pay $3 each which is still more then the value of the boards - they can't have cracked/broken screens though - those they charge for so those I do tear down
If you can find a company in your area like Dynamic in my opinion you are better off selling them as whole monitors
Kurt
If you can find a company in your area like Dynamic in my opinion you are better off selling them as whole monitors
Kurt
A little off the subject but there is a much more valuable item that looks almost exactly like those metal sticks in the 1st photo. In the late '80s, a guy brought in several hundred pounds of of what we called, "copper sticks", about the same dimensions as those. Some were as long as 24" and all were about 3/32" x 3/16" copper rod, in cross section, I think. They were fairy heavy. Every 2 or 3 inches, there was about a 2" long section of gold plating. It was first time I had seen them. At the time, gold was about $400 and these damned things assayed at about $80 a pound. Some of the thickest gold plating I've ever seen. I really hit a lick. I was told they were used in telephone switching stations. They were probably some sort of contact that took a lot of abuse. A perfect job for the sulfuric stripper.
lysdexic
Well-known member
Were those metal pieces the reflectors for the florescent lights? I have only taken about 1/2 doz lcd monitors and I think one of them had reflectors that looked to be brass (on the outside portion) and some shiny silver colored substance on the inside. The others were plastic with what looked like the silver mylar that balloons and plastic mirrors are made of.ilyaz said:
The gold colored fingers on the boards I tried to process with some other gold plated boards in CuCl etching solution. The ribbons seemed to be glued to these rather than soldered and the fingers were mostly still there long after the gold traces on the boards were gone.
The screen itself I took one corner where the vertical and horizontal leads met and peeled/scraped the silvery plastic coating on the front and the dark shaded one on the back and then broke off that corner and separated the two pieces. I wiped off the liquid crystal and removed all the adhesive. Both pieces of glass have a grid work on them. One had what looked to be gold traces around the edge of the glass, scraping the grid work I saw a hint of copper color but nothing that suggested gold. The other piece of glass had a silver color trace arounf the edge and the grid looked silver colored. I can't imagine the glass being covered with a PM grid and I have no idea how to check to see if it's Indium (or what Indium even looks like). I'm going to keep the 2 pieces of glass until I have nitric and can do some testing. I have no idea how to dispose of the liquid crystals and it's way too much labor for the little bit of gold trace (if it is gold) even for me. I know that there are backlight reflectors that are sputter coated with silver and I'm guessing it is the transparent yet silvery looking plastic sheet(s) behind the screen. If you can see light through them there can't be much silver on them.
The only thing I found of real value was a chip on one of the boards (it may have been a camera component, don't know I didn't notice it till I was depopulating the boards) but it was clear and had a spiderweb of gold wires that attached directly to the board.
The only reason I took the flat screens was because I learned long ago when scrapping that if you take the lower value items as well as the higher value people are more likely to find more junk they don't want... and spread the word about you. So I take flatscreens just won't take anything with a CRT.
lysdexic
Well-known member
my mistake... the reflector is the plastic piece the light is mounted in.
http://www.tracelogix.com/backlights.php
http://www.tracelogix.com/backlights.php
